You can also connect DTE to DTE, as well as DCE to DCE, via null-modem
cable. So, analogy with FXO/FSO is not correct.

Sasa

Chuck's Long Road wrote:
> 
> Someone smarter than I made the following statements about FXO / FXS, in
> order to help me understand real world connectivity.
> 
> That person said to think of FXO / FXS as something analogous to DTE / DCE.
> 
> That is, DTE connects to DCE ( and visa versa ) and that FXO connects to
FXS
> ( and visa versa )
> 
> In other words, an analog telephone set is an FXO device, and therefore
> plugs into an FXS port. The FXS port provides the signaling to the FXO
> device.
> 
> Similarly, a PBX, or a CO switch, for that matter, is an FXS device that
> provides signaling, and therefore plugs into an FXO port.
> 
> This seems to fit in with what I know - that you connect a router to a PBX
> or to the telco CO switch via an FXO port, and you connect an analogue fax
> or telephone into a router FXS port.
> 
> Any comments? Reasonable way to think of things?
> 
> Thanks.
> 
> Chuck




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